Note 3 — Chapter I · The Youth of George Washington.

“During the last summer that he was at school, we find him surveying the fields around the school house, and in the adjoining plantations, of which the boundaries, angles, and measurements, the plots and calculations, are entered with formality and precision in his books. He used logarithms, and proved the accuracy of his work by different methods.”—Sparks’ Life of Washington, p. 6.